Exhibit 99.1 Quest Resource Holding Corporation Reports First Quarter 2026 Financial Results Higher sequential volumes from Industrial customers and continued growth from non-Industrial portfolio drove 5% revenue growth and 6% gross profit growth compared to prior quarter Improved revenue and gross profit performance throughout the quarter Added a large franchisee in the quick-service restaurant industry in April, which launched in May IRVING, TX – May 7, 2026 – Quest Resource Holding Corporation (Nasdaq: Q ...